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Author
Author email
[email protected]
Author website
www.rickeyworld.info

Description



DS1307 is a hardware realtime clock, which works on I2C protocol. Better graphics using the same old fashioned alphanumeric LCD (type HD44780). Icons which shows the status for Alarm ON/OFF state, which gives a nice and cute look to the clock.

There are four switches connected to the uC, as shown in the figure. Function of the keys are same as clear from their names.

When the power supply is switched on it will give you the default date and time, but later you can change it to the desired value. After setting once, the backup battery will keep the clock ticking even after the power is not there.

A little about I2C:
There are basically four main conditions in I2C protocol.
1) Start Condition
2)Stop Condition
3)Data Validity
4)Acknowledgement

1)Start Condition:
when SCL is high and SDA H->L, will be taken as start condition for the communication.
2)Stop Condition:
when SCL is high and SDA L->H, will generate a stop condition.
3)Data Validity:
When SCL is high there should be no chande in SDA line only then the data is valid, the data change should be made only when SCL is low.
4)Acknowledgement:

After sending of one byte of data the reciever has to acknowledge the sender for the successful reception. for this the sender make the SDA line high and reciever pulls down the SDA low, which tells the sender that data has reached safely.

Now the source code written in assembly, basically implements the I2C protocol. the assembly source written for Keil download here clock.asm and the direct hex file for programming the controller from here clock.hex. The schematic for the Digital clock is available in PDF format can be downloaded from here clock.pdf.

Project code has been revised and updated. Bug fixes regarding corrupt display.

History:
First Upload date:
08/05/2006
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Conversation

Sat Jul 25 2015, 10:37 PM
Arnali
What does the cross means? The ones from pin 7,8,9,10 of the LCD?
Fri Jul 24 2015, 09:53 AM
HARSHAL PATIL
....
shyam
Thu Jul 23 2015, 01:42 PM
hi Ajay
ajay_bhargav
Mon Jul 20 2015, 04:38 AM
@Rohit Biradar, I am glad my tutorial helped
Thu Jul 16 2015, 06:19 PM
Rohit Biradar
Thanks a lot publisher of this tutorial. Everybody tells about the nibble sending methods and the command set for 4-wire lcd interface. You are the first to tell me about the most important part that is resetting the lcd. This thing got me all day. Now I can sleep in peace. Thanks once again. Million thanks.
Thu Jul 16 2015, 12:24 PM
Baby
my project is related to control the door in dam. by keil program how can i control the same.
Thu Jul 16 2015, 09:12 AM
rutuja
plzzz giveme more details about this project.if i want to type any words then how it will be happen bcoz no more letters are on remote.suggest about it
Sat Jul 11 2015, 09:55 AM
Abhijit Deshmukh
ok
Wed Jul 01 2015, 05:14 PM
ShubhamBansal1996
i am making a project of connecting 4 8051's using a can bus for which i am using mcp2515 and mcp2551.but before making it i want to ensure it works by simulating it on proteus though the two ic's mentioned above dont seem to have models in proteus so is there anyone who can help me with that
ExperimenterUK
Tue Jun 30 2015, 05:24 PM
@sachinmm The 8051 timer can't do 1 second. It can do 50ms so count 20 times

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KDN
Wed Jul 29 2015, 05:14 AM
Tanvir.
Fri Jul 24 2015, 07:59 AM
erummumtaz
Thu Jul 23 2015, 10:47 PM
balvant
Thu Jul 16 2015, 03:56 PM
seoulmak
Mon Jul 13 2015, 01:21 PM
SHIVKHUMAR
Sat Jul 11 2015, 04:10 AM
Nals99
Fri Jul 03 2015, 08:33 AM
Mc_Comet32
Thu Jun 25 2015, 11:42 AM

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Forum Activity
Mc_Comet32 Avatar
Posted By Mc_Comet32
Sun Jul 26 2015, 05:49 PM
ExperimenterUK Avatar
Posted By ExperimenterUK
Thu Jul 23 2015, 08:14 PM
Try this link.Basically find the tacho output pin...
seoulmak Avatar
Posted By seoulmak
Mon Jul 20 2015, 03:44 PM
ajay_bhargav Avatar
Posted By ajay_bhargav
Mon Jul 20 2015, 04:42 AM
Ok then, check if you did not mention "LCD_ClearSc...
ajay_bhargav Avatar
Posted By ajay_bhargav
Mon Jul 20 2015, 04:41 AM
I am assuming you're talking about the small CPU f...
ajay_bhargav Avatar
Posted By ajay_bhargav
Mon Jul 20 2015, 04:36 AM
Amit Kumar Das Avatar
Posted By Amit Kumar Das
Sun Jul 19 2015, 04:17 AM
Yes they are fine. I have included everything. Una...
seoulmak Avatar
Posted By seoulmak
Fri Jul 17 2015, 08:41 AM
yes, but i need more information to connect the f...
balvant Avatar
Posted By balvant
Thu Jul 16 2015, 04:07 PM
ExperimenterUK Avatar
Posted By ExperimenterUK
Wed Jul 15 2015, 05:42 PM
Is this a project listed on this site ?